Venting and Dehumidifying a Crawlspace
I have a 1920’s home in Berkeley, CA with a 1,200 sq ft crawlspace that has only one 6″ x 8″ vent. I’m wondering if I should close the vent and run a dehumidifier, or add another vent.
I’m in the process of air sealing and insulating the rim joists and ceiling of the crawlspace, so it will get colder down there. Relative humidity hovers around 60s and sometimes low 70s.
Rat slab on the ground. I’ll eventually put in a vapor barrier, but that may be another couple years due to other projects.
We have a boiler with cast iron radiators for heat, but no radiators in the crawlspace (of course) and no easy way to condition the air.
I’m going to put in the dehumidifer no matter what, unless someone tells me that’s a bad idea. My main question is whether I add a vent, or close up the existing one, or just leave as is. If there are other options I’m not thinking of, please share!
Thanks so much! This community is amazing btw.
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